蚕丝织物上茜草染料的光老化

Light aging of madder on silk

模拟茜草染色丝绸文物在展览时的自然光老化过程,设计了一套系统的光老化实验。采用荧光紫外灯、卤素灯和白光LED灯,对自制茜草染色样品进行光老化实验,得到3种照明条件下染料的褪色规律曲线,并用高效液相色谱对光老化的内在规律和机制进行更进一步的分析。结果表明:紫外辐射对茜草染料破坏较严重;卤素灯照明下染料褪色速率稍慢于LED灯;陕西茜草的主要色素成分经鉴定为茜紫素,其峰面积的变化规律与光老化程度具有较好的对应关系。

To simulate the natural light-aging process of the madder on silk during cultural relics exhibition,a series of systematic tests were carried out.Fluorescent UV lamp,halogen lamp and white LED were chosen in the light aging experiments.Three kinds of fading curves were gained under irradiation of different lamps,and HPLC was used to analyze the internal rule and mechanism of the light aging of madder.The results indicated that madder was destroyed seriously under the irradiation of UV light;madder faded a little slower under the irradiation of halogen lamp than LED lamp.Identification test shows that purpurin is the main coloring matter in madder from Shaanxi,and the change of its area of peak in HPLC can well reflect the degree of light aging.